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POP can chrony is useless and will never give you an accurate FPS.
Gear timing is a myth.
Your problem lies with air sealing. Maybe D-Boys mech boxes have an issue with air sealing and they compensate with a stronger stock spring in comparison to let's say TM? I would take the D-Boys spring and put it into a TM mech box and see what FPS it gives. You may find that the D-Boys spring in a TM will give you over 400 FPS.
Just a theory, as I have no experience with D-Boys, however I have plenty of experience overall.
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